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Electrical hand power tool with battery pack

a technology of hand power tools and battery packs, which is applied in the direction of portable power tools, manufacturing tools, cell components, etc., can solve the problems of failure of locking action and greater play

Inactive Publication Date: 2010-11-09
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is an electrical hand power tool with a battery pack that can be locked to the housing of the tool. The problem addressed by the invention is that the play between the battery pack and the housing of the tool can cause wear of the detent elements of the locking mechanism, leading to failure of the locking action. The solution is a spring / damping element that dampens vibration-caused relative motions between the battery pack and the housing of the tool, and simultaneously eliminates the play between them. This reduces the likelihood of wear of the detent elements and makes the hand power tool of high quality. The spring / damping element can be provided on either the housing or the battery pack, and it enters into touch engagement with a surface of the other component oriented perpendicular to the primary vibration direction of the tool.

Problems solved by technology

As a consequence of this play, because of operation-caused vibration and the inertia of the battery pack, relative motion between the battery pack and the housing of the hand power tool occurs in operation of the hand power tool.
In interplay with environmental factors, such as dust, these relative motions can cause wearing of detent elements of the detent-locking device, leading to greater play, to the extent of failure of the locking action.

Method used

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  • Electrical hand power tool with battery pack

Examples

Experimental program
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Embodiment Construction

[0015]The electrical percussion drill screwdriver 2 with a battery pack 4 shown in the drawing essentially comprises a housing 6 with a grip part 8, an electric motor with a step-down gear (not shown), accommodated in the housing 6, a quick-action drill chuck 10, protruding past the housing 6 and driven by the step-down gear, for chucking a drill or screw insert (not shown), a torque adjusting ring 12 located between the fast-action drill chuck 10 and the housing 6, and the battery pack 4, locked releasably to the lower end of the grip part, for supplying direct current to the electric motor independently of the power grid.

[0016]The housing 6 of the percussion drill screwdriver 2 is provided, on the upper end of the grip part 8, with an on / off switch 14 and a rotation or direction-reversing switch 16 with an activation lock and on its top, it has a switch 18 for first and second gear and also has a magnet plate 20. An additional handle 22 is releasably secured to one side of the hou...

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Abstract

The invention relates to a hand power tool (2), having a housing (6), an electric motor accommodated in the housing (6), and a battery pack (4), releasably locked to the housing (6), for supplying the electric motor with electric current. At least one spring / damping element (38), mounted between the battery pack (4) and the housing (6) of the hand power tool (2), is provided, for damping vibration and -or eliminating a locking-dictated play between the battery pack (4) and the housing (6).

Description

CROSS-REFERENCE TO A RELATED APPLICATION[0001]The invention described and claimed hereinbelow is also described in German Patent Application DE 103 18 947.5, filed on Apr. 26, 2003. This German Patent Application provides the basis for a claim of priority of invention under 35 U.S.C. 119(a)-(d).[0002]The invention relates to an electrical hand power tool, having a housing, a direct-current motor accommodated in the housing, and a battery pack, which can be locked to the housing, for supplying the direct-current motor with electric current.PRIOR ART[0003]Electrical hand power tools, such as percussion screwdrivers, power drills, right angle grinders, saber saws, circular saws, or planing machines for professional craftsmen or the do-it-yourselfer typically have either an alternating current motor or a direct-current motor as the driving motor. While the alternating current motor is as a rule supplied with alternating current from the power grid via a power cord, the electrical energy...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): B25F5/00H01M2/10H01M50/242H01M50/244H01M50/247
CPCB25F5/006H01M2/1022Y02E60/10H01M50/247H01M50/242H01M50/244
Inventor HOFMANN, ALBRECHTKRONDORFER, HARALDHECKMANN, MARKUSHECKMANN, LEGAL REPRESENTATIVE, KERSTENSCHADOW, JOACHIMSCHOMISCH, THOMAS
Owner ROBERT BOSCH GMBH
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